Fluid mingling muffler with fibrous walled side branch chambers



May 23, 1950 R. D. MAY 2,508,463

FLUID MINGLING MUFFLER WITH FIBROUS WALLED SIDE BRANCH CHAMBERS FiledNov. 25, 1948 Patented May 23, 1950 UNETED STATES PATENT OFFICE FLUEDMHNGLING MUFFLER WITH FHPBROUS WALLED SIDE BRANCH CHAMBERS 1 Claim.

This invention relates generally to internal combustion engines and.particularly to a muffler tip for exhaust pipes on motor vehicles.

The main object of this invention is to provide a tip for the exhaustpipe of a truck or other gas motor driven vehicle which will send theexhaust gases upwardly and at the same time dilute these gases with airby entraining air from the lower or ground level and elevating it to apoint where it can be carried off by the wind or distributed in theatmosphere.

A further object is to produce a tip which will not only serve to muiilethe sound of the xpanding gas but will also materially reduce thevibration of the tail pipe.

Another object is to utilize the speed of travel to increase the actionof the tip.

A still further object is to secure an improved muffling action.

These and other objects are accomplished in the manner set forth in thefollowing specifica tion as illustrated in the accompanying drawings, inwhich:

Fig. l is a vertical section through the tip showing its relation to atail pipe.

Fig. 2 is a section taken along the line 2-2 in Fig. 1.

Fig. 3 is a perspective view of a truck showing the tip mounted thereon.

Fig. 4 is a fragmentary expanded view of the pocket section of the tip.

Like numbers of reference refer to the same or similar parts throughoutthe several views.

Referring in detail to the drawing, there is shown an exhaust or tailpipe ll] of the vertical type such as are commonly used on motor trucksI I.

My muffler tip is formed within a cylindrical outer shell !2 whose lowerend i3 is cut at an angle of about 45 in order to present an open frontto pick up air when the vehicle I I is moving forward.

The shell I2 is supported on the upper end of the pipe I!) by a clamp Mwhich is attached to the shell ill by means of the bolts IS. A setscrewI6 is provided in the clamp M in order to securely fasten the device tothe pipe Ill.

Four centering screws l1 are provided around the shell l2 and theirpoints bear against the pipe l and locknuts is hold the screws I! inplace just above the upper end is of th pipe l0.

Disposed directly above the pipe II] is a sleeve 20 of wire cloth inwhich are formed the pockets 2| and 22 by merely bending the sides 23outwardly as shown in Fig. 2. Surrounding the sleeve 20 is a muiilercase 24 which is cylindrical and provided with a lower cover 255 whichextends to the pipe ii! and with an upper cover 25 which extends to thetip 2? whose lower end 28 extends into the upper end of the sleeve 2!].

The shell 52 is provided with a partial cover 29 whose upturned centralflange 3!! is spaced from the tip The space between the sleeve 2!! andcase 24 outside of the pockets 2| and 22 is filled with steel wool orother fibrous material, 22A.

The shell I2 and case 24 are held in concentric relationship by means ofthe tubular spacers 3| and bolts 32.

In actual use, the device numerous advantages which do not appear from acasual inspection.

The pocket formation within the fibrous liner provides a remarkabledampening of the noises from the exhaust also a lessening of thevibrations in the exhaust pipe itself. The tip also the gas upwardly atan accelerated speed d e to the air entrained by the gas itself and bythe addition of a volume of air picked up by the forward. travel of thevehicle, thereby sending the exhaust gases high into the air where theywill be diluted by the air to an extent which will make them harmless.Also, by the use of this construction, the tip can be easily installedand actually forms an extension for the exhaust pipe itself.

I claim:

An exhaust tip consisting of an outer shell, an inner sleeve of wirecloth and an intermediate mufiler casing. the two latter members beingdisposed within the outer shell and concentric therewith, said sleevehaving outwardly flanged pockets formed therein, a steel wool fillerbetween said screen and casing around said pockets, upper and lowercovers for the space between said sleeve and casing, the lower coverreceiving the upper end of an exhaust pipe an exhaust tip extendingupwardly from the upper cover, the lower end of said outer shell havingan inclined edge, means for holding said shell and its enclosed partsupon the upper end of an exhaust pipe and spaced from said exhaust tip.

RAY D. MAY.

REFERENCES CITED The following references are of record in the file ofthis patent:

FOREIGN PATENTS Number Country Date 449,507 Great Britain June 29, 1936471,431 Great Britain Sept. 3, 1937

